2
1 DESCRIPTION
RKF phase monitoring relays are electromechanical switching
devices that are designed to monitor the voltage level in three-phase
AC networks and to protect the load in the event of a drop or increase
in the supply voltage beyond the preset values, as well as in the event
of phase loss, incorrect phase sequence and voltage asymmetry.
Over- and undervoltage setpoints can be adjusted (see Table 2). The
available functions for each type of relay are presented in Table 1.
Phase monitoring relays complies with IEC 60947-5-1:2009.
2 TECHNICAL DATA
Table 1
Characteristics Values
Connection 3-wire 4-wire
Supply voltage Un, V 380/400/415 220/230/240
Operating voltage range, V 266-540 154–312
Rated frequency, Hz 50/60
U> setting range (1,05~1,25)*Un
U< setting range (0,75~0,95)*Un
Name
Overvoltage,
U>
Undervoltage,
U<
Phase
loss
Phase sequence
fault
Voltage
asymmetry
RKF-31 • •
RKF-34 • • •
RKF-37 • • • • •
Table 2 - Technical data
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